One of the Ontario Genealogical Society 50th anniversary projects is The Ontario Name Index, TONI for short.
With just 79,621 records available at present it's just getting started. Only records contributed by Wellington (the majority) and Kawartha Branches are now online. There is a promise that it will "quickly become large – perhaps as many as fifty million entries."
Other sources to be added are birth, christening/baptism, death, funeral card, family history, marriage, newspaper article, obit, township papers and Tweedsmuir history.
Even with the starter database it's easy to anticipate problems with common names not being well enough distinguished to make a pay per view purchase attractive.
Find TONI at http://www.ogs.on.ca/home/TONI.php